Zig Zagged: The Dark Lord's ground forces storm towards walls of the Shining City, only to stop short of the walls and send a few highly trained specialists to tear down the walls. In the mean time, an entire second army tunnels below the walls and starts a Zerg Rush on the castle inside the walls of the city.
Averted: The Dark Lord’s armies are moderately sized and of moderate power.
Enforced: “If we make the Dark Lord’s goblins individuals of worth, the hero’s might lose sympathy for killing them; give them a hive-mind.”
Lampshaded: “Why do our enemies always choose quantity over quality?”
Invoked: "Even though we can't win, let's charge them now and take as many as we can with us."
Defied: The Dark Lord marches towards the Shining City with his army, seeing only a small group of defenders is present. Despite this, he carefully plans his assault.
Discussed: "Should we charge the city now, sir?" "No, we would get slaughtered if we don't plan this carefully."
Conversed: "An army of goblins are attacking handful of humans. Most of them will die before they win."
The Dark Lord is so committed to victory that he doesn’t care about mass death of his goblins, causing his massive army to rebel against him.
Sending the goblins against the Shining Ones only results in them being obliterated without even touching the Shining Ones.
The massive casualties suffered by the goblins severely depletes the Dark Lord's armies, making the Shining Ones' victory all but inevitable.
Since goblins are so plentiful, the Dark Lord has no problem strapping bombs to them, making them horrifyingly radioactive, and/or infecting them with a veritable bouquet of incredibly virulent diseases before sending them into battle against the Shining Ones. The Shining Ones can easily defeat goblins in conventional combat, but the Dark Lord's ruthless tactics make it even more unpleasant than usual for everyone involved.
Reconstructed: The Dark Lord actually preformed a thorough tactical analysis of the situation and came to the conclusion that attacking en masse would have the greatest chance of success, and the rapidity of the conquest would result in less casualties in the long term and keep morale high.